Automatic selecting-switch



A. B. SPEHRY.

AUTOMATIC SELECTING SWITCH. v APPLICATION FILED IuNE, 1918.

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' partly ARTHUR B. SPERRY,

INCORPORATED,

OF NEW YORK, N. Y., A

OF NEW YORK, N.

SSIGNOR TO WESTERN ELECTRIC COMPANY, Y., .A CORPORATION OF NEW YORK.4

AUTOMATIC SELECTING-SWITCH.

Specification of Letters Patent.

ratentedinpr. 2o, 1920.

Application led June 6, 11918. Serial No. 538,483. A y

New York, have invented certain new and useful Improvements in Automatic Selecting-Switches,4 of which the following is a full, clear, concise, 'and exact description.

This invention relates to automatic selective switches of a type used in telephone systems, and its object is to provide a simple switch of rugged construction which can be manufactured cheaply, and which embodies certain novel features of construction and operation. n

According to such features, two solenoids for moving the brushes over their associated contacts are oppositely arranged and a switching device is employed whereby when one solenoid has moved the last contact in one direction, that solenoid will be rendered ineffective and the other will be rendered effective for thereupon moving the brushes in the opposite direction.

Through such means this switch may be used as a trunk hunting or line switch having a continuous reciprocating motion which will be arrested only by the nding of an idle trunk or the abandonment of the search for an idle trunk. v

The preferred embodiment of the structure is shown in the drawings, Figure 1 being a plan view; and Fig. 2, an end view, in section, taken on line 2 2, of the essential elements of the present invention.

The solenoids 1 and 3 are so arranged that a core 4 may be moved back and forth through their centers in somewhat the same manner as the piston in a steam water pump. At the center of the common core 4:, there is a member 5 which coperates with and acts as a means for moving the switch brushes.

The switch brushes 6, 7 and 8 are mounted on a shaft 9 andare arranged to move over and make contact with the bank of terminals 10. Secured to the shaft 9 are the members 11 which coperate with the member 5 to transmit the motion of the solenoid core t to the brushes. Also attached to the shaft 9 there is a member 12 in the form of a sector in whose periphery there are cut a number of notches which coperate with a roller 18 on a spring 14 to properly positin .the

switch brushes.

brushes to the '15 through Securely attached to the mounting of the solenoid 1, there are three contact springs 15, 16 and 17. When contact spring, 16 is in electrical connectionl with spring 17` the solenoid l may be energized to move the brushes'in a counter-clockwise direction and when the spring 16 is in electrical connection with spring 15, the solenoid 3 may be energized to move the brushes in a clockwise direction. A member 18 controls the coperation of the spring 16 with the respective springs 15 and 17; and in the embodiment under consideration, functions as a detent for holding the spring 16 in one of its operative positions. Through the means of member 18 and a pin 19, secured to the member 11, the shifting of the electrical connection between the springs 15, 16 and 17 is accomplished. `When the brushes have moved to the extreme limit of their movement in a counter-clockwise direction, the pin 19 will bear against the lower end of the spring 16 and electrical connection will be made with the spring 15. Thereupon the resilient member 18 will move upward and when the brush is again moved away, held in electrical connection with the spring the upturned part 20 of the member 18. Thereafter the solenoid 3 will be effective until the eXtreme limit of the movement of the brushes in the counter-clockwise direction is reached, whereupon the pin 19 in bearing on the upturned portion 21 of the resilient memberl 18 will cause the release of spring 16 and its electrical connection to the spring 17. the energization of the solenoid 1 will be caused to move in a counter-clockwise directhe spring 16 will be Thereafter the brushes through tion until, as before described, the spring 16 is again caused to make electrical connection with the spring 15.. I

`What is claimed is:

1. Tn an automatic selective switch, the combination with a bank of terminals and a set of coperating brushes, of a reciprocatory element to which the brushes are operatively connected, a pair of electromagnets for the operation of said element,'a pair of 2. In an automatic 'selective switch, thel combination with a bank of terminals and a 5 set of coperating brushes, of a reciprocatory element to which the brushes are operatively connected, a pair of electromagnets for the operation of said element, a pair of contacts, one for each magnet, a third contact for alternate engagement with the contacts of each pair, 'a member having movements by which it controls the operation of said third contact, and operative connections between -said reciprocatory element and'said member effective at a period of the movement of said element.

3. In an automatic selective switch, the combination with a bank of terminals and a set -of coperating brushes, a reciprocatory element to which the brushes are operatively connected, a pair of electromagnets for the operation of said element, a movablecontact for controlling the operations of the respective magnets, and al detent for holding said contact in one position, said element operating at one extreme of its movement to move said contact and at the other extreme to move said element.

4. In an automatic selective switch, the combination with a bank of terminals and a set of cooperating brushes, of a shaft on which the brushes are mounted, an operating arm also mounted on said shaft, a pair of solenoids having a common core connected to said arm, a movable contact for controlling the o eration of the respective solenoids, la detent or holding said contact in one position, and a pin on said arm operating at one extreme of the movement of the arm to move the contact into the position in which it is held by the detent and at the other extreme of the movement of said arm to move the detent and thereby release the contact.

In Witness whereof, I hereunto subscribe my name this 1st day of June A. D., 1918.

ARTHUR B. SPERRY. 

